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How could I make a variable interval buzzer/vibrating device? Answered

I would like to make a small device, perhaps the size of 3-4 stacked half-dollars, that could be programmed to vibrate lightly at various intervals (like every minute or two minutes or 3.5 min, etc). Could anyone help me with how I could make something like this?

The size could vary, but I want it to be a discrete device that would only draw the attention of its user for a brief moment every interval (depending on how long the interval is programmed to be). I am very new to doing anything with electronics, so I'd greatly appreciate any advice or guidance.